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From dlaboss <...@git.apache.org>
Subject [GitHub] incubator-edgent pull request #306: [Edgent-409] add analytics.math3.Aggrega...
Date Thu, 20 Apr 2017 15:59:53 GMT
Github user dlaboss commented on a diff in the pull request:

    --- Diff: analytics/math3/src/main/java/org/apache/edgent/analytics/math3/UnivariateAggregator.java
    @@ -0,0 +1,47 @@
    +Licensed to the Apache Software Foundation (ASF) under one
    +or more contributor license agreements.  See the NOTICE file
    +distributed with this work for additional information
    +regarding copyright ownership.  The ASF licenses this file
    +to you under the Apache License, Version 2.0 (the
    +"License"); you may not use this file except in compliance
    +with the License.  You may obtain a copy of the License at
    +  http://www.apache.org/licenses/LICENSE-2.0
    +Unless required by applicable law or agreed to in writing,
    +software distributed under the License is distributed on an
    +KIND, either express or implied.  See the License for the
    +specific language governing permissions and limitations
    +under the License.
    +package org.apache.edgent.analytics.math3;
    + * Univariate aggregator for tuples.
    + * This is the runtime implementation interface
    + * of {@link UnivariateAggregate} defined aggregate.
    + */
    +public interface UnivariateAggregator {
    +    UnivariateAggregate getAggregate();
    +    /**
    +     * Clear the aggregator to prepare for a new aggregation.
    +     * @param n Number of tuples to be aggregated.
    +     */
    +    void clear(int n);
    +    /**
    +     * Add a value to the aggregation. 
    +     * @param value Value to be added.
    +     */
    +    void increment(double value);
    +    /**
    +     * Get the aggregation result.  It may be a NaN (empty collection, etc) or Infinite
    +     * @return the result
    +     */
    +    double getResult();
    --- End diff --
    fyi, getResult() is different style than the "add to result" JsonUnivariateAggregator.result(...,
    Having getResult(), rather than "add to result" result(ResultMap), enables subsequent
    of UnivariateAggregate/UnivariateAggregator by JsonAnalytics without requiring 
    its implementation to use ResultMap.

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